/* Copyright  2009
   @Author
   Richard Changde Yin            e-mail yinchangde@hotmail.com

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
   
/**
 *@period_add.cc
 */ 

#include "server_includes.h"
#include CSTDINT_H
#include "function/time/period_add.h"
#include "calendar.h"

int64_t Item_func_period_add::val_int()
{
  assert(fixed == 1);
  uint32_t period= (uint32_t) args[0]->val_int();
  uint32_t months= (uint32_t) args[1]->val_int();

  if ((null_value= args[0]->null_value || args[1]->null_value) ||
      period == 0L)
    return 0; /* purecov: inspected */

  return (int64_t) months_to_year_month(year_month_to_months(period) + months);
}
